<?php
function getRand($proArr) {
	$result = '' ;
	//概率数组的总概率精度
	$proSum = array_sum($proArr);
	//概率数组循环
	foreach ($proArr as $key => $proCur) {
		$randNum = mt_rand(1, $proSum);
		if ($randNum <= $proCur) {
			$result = $key;
			break;
		} else {
			$proSum -= $proCur;
		}
	}
	unset ($proArr);
	return $result;
}
function getPrize($prize_arr)
{
	/*$prize_arr = array(
			'0' => array('id' =>1,'min' =>1,'max' =>29,'content' =>'一等奖','v' =>2,'num'=>10),
			'1' => array('id' =>2,'min' =>302,'max' =>328, 'content' =>'二等奖','v' =>5,'num'=>8),
			'2' => array('id' =>3,'min' =>242,'max' =>268, 'content' =>'三等奖','v' =>10,'num'=>5),
			'3' => array('id' =>4,'min' =>182,'max' =>208, 'content' =>'四等奖','v' =>50,'num'=>3),
			'4' => array('id' =>5,'min' =>122, 'max' =>148, 'content' =>'五等奖','v' =>100,'num'=>2),
			'5' => array('id' =>6,'min' =>62, 'max' =>88, 'content' =>'六等奖','v' =>490,'num'=>1),
			'6' => array('id' =>7,'min' =>array(32, 92, 152, 212, 272, 332),'max' =>array(58, 118, 178, 238, 298, 358), 'content' =>'谢谢参与' , 'v' =>600,'num'=>0)
	);*/
	
	foreach ($prize_arr as $key => $val) {
		$arr[$val['id' ]] = $val['v' ];
	}
	$rid = getRand($arr); //根据概率获取奖项 id
	$res = $prize_arr[$rid-1]; //中奖项
	/*$min = $res['min' ];
	$max = $res['max' ];
	if($res['id']==7){ //七等奖
		$i = mt_rand(0, 5);
		$result['angle' ] = mt_rand($min[$i], $max[$i]);
	} else{
		$result['angle' ] = mt_rand($min, $max); //随机生成一个角度
	}
	$result['content' ] = $res['content'];
	$result['id']=$res['id'];
	$result['num']=$res['num'];*/
	$res['sncode']=strtoupper(substr(md5(time()),mt_rand(1,18), 15));
	return $res;
}
?>